Circuit Description
The Powertrain Control Module (PCM) supplies a voltage of about 0.45 volts to the Oxygen Sensor 1 (O2S 1). The O2S 1 varies the voltage between a range of about 1 volt if the exhaust is rich, down through about 0.10 volt if the exhaust is lean.
The O2S 1 is like an open circuit and produces no voltage when the O2S 1 temperature is below 315°C (600°F). An open O2S 1 circuit or cold sensor causes an Open Loop operation.
Conditions For Running The DTC
| • | No active MAP DTC's |
| • | No active IAT DTC's |
| • | No active ECT DTC's |
| • | No active TP DTC's |
| • | No active Fuel Trim DTC's |
| • | No active Injector Control DTC's |
| • | No active Misfire DTC's |
| • | No active CKP DTC's |
| • | No active EVAP DTC's |
| • | No active IAC DTC's |
| • | No active PCM Memory DTC's |
| • | Air flow is more than 3 grams per second. |
| • | Engine Coolant Temperature (ECT) is more than 70°C (158°F). |
| • | Engine is operating in Closed Loop. |
| • | Throttle Position (TP) angle is between 5 percent and 50 percent. |
| • | Engine has met the above conditions for 30 seconds. |
Conditions For Setting The DTC
O2S 1 voltage is more than 946 mV for 50 seconds.
Or
O2S 1 voltage is more than 1042 mV for 50 seconds while in deceleration mode.
Action Taken When the DTC Sets
| • | The control module illuminates the malfunction indicator lamp (MIL) if a failure is detected during 2 consecutive key cycles. |
| • | The control module sets the DTC and records the operating conditions at the time the diagnostic failed. The failure information is stored in the scan tool Freeze Frame/Failure Records. |
Conditions for Clearing the MIL or DTC
| • | The control module turns OFF the MIL after 3 consecutive drive trips when the test has run and passed. |
| • | A history DTC will clear if no fault conditions have been detected for 40 warm-up cycles. A warm-up cycle occurs when the coolant temperature has risen 22°C (40°F) from the startup coolant temperature and the engine coolant reaches a temperature that is more than 70°C (158°F) during the same ignition cycle. |
| • | Use a scan tool in order to clear the DTCs. |
Diagnostic Aids
The DTC P0132 or the rich exhaust is most likely caused by one of the following conditions:
| • | The fuel pressure - The system will go rich if the fuel pressure is too high. The PCM can compensate for some increase. However, if the fuel pressure gets too high, a DTC P0132 will set. Refer to Fuel System Diagnosis . |
| • | A leaking injector - A leaking or faulty fuel injector can cause the system to go rich causing a DTC P0132. Refer to the Injector Coil Test Procedure. Refer to Fuel Injector Solenoid Coil Test - Engine Coolant Temperature Between 10-35 Degrees C (50-95 Degrees F) and Fuel Tank Leak Check . |
| • | The Electronic Ignition (EI) shielding - An open ground circuit may result in EMI or induced electrical noise. The PCM looks at this noise as Crankshaft Position (CKP) sensor pulses. The additional pulses result in a higher than actual engine speed signal. The PCM then delivers too much fuel causing the system to go rich. The engine tachometer will also show higher than actual engine speed which can help in diagnosing this problem. |
| • | The MAP sensor - An output that causes the PCM to sense a higher than normal manifold pressure, or low vacuum, can cause the system to go rich. Disconnecting the MAP sensor will allow the PCM to set a fixed value for the MAP sensor. Substitute a different MAP sensor if the rich condition is gone while the sensor is disconnected. |
| • | A pressure regulator - Check for a leaking fuel pressure regulator diaphragm by checking for the presence of liquid fuel in the vacuum line to the regulator. |
| • | The TP sensor - An intermittent TP sensor output will cause the system to go rich due to a false indication of the engine accelerating. |
| • | An O2S 1 contamination - Inspect the O2S 1 for a silicone contamination from fuel or use of improper RTV sealant. The O2S 1 may have a white powdery coating and result in a high but false voltage signal (rich exhaust indication). The PCM will then reduce the amount of fuel delivered to the engine causing a severe surge or driveability problem. |
| • | Whenever the oxygen sensor pigtail wiring, the connector, or the terminal are damaged, replace the entire oxygen sensor assembly. Do not attempt to repair the wiring, the connectors, or the terminals. In order for the sensor to function properly, the O2S 1 must have a clean air reference. The oxygen sensor wires obtains this clean air reference. Any attempt to repair the wires, the connectors, or the terminals could result in the obstruction of the clean air reference. Any attempt to repair the wires, the connectors, or the terminals could degrade the oxygen sensor's performance. |
An intermittent may be caused by any of the following conditions:
| • | A poor connection |
| • | Rubbed through wire insulation |
| • | A broken wire inside the insulation |
Thoroughly check any circuitry that is suspected of causing the intermittent complaint. Refer to Intermittents and Poor Connections Diagnosis in Wiring Systems.
If a repair is necessary, refer to Wiring Repairs or Connector Repairs in Wiring Systems.
Test Description
The numbers below refer to the step numbers on the Diagnostic Table.
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The Powertrain OBD System Check prompts you to complete some of the basic checks and to store the freeze frame and failure records data on the scan tool if applicable. This creates an electronic copy of the data captured when the malfunction occurred. The scan tool stores this data for later reference.
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This step determines if the DTC P0132 is the result of a hard malfunction or an intermittent condition. It may be necessary to operate the vehicle within the Freeze Frame conditions and Conditions for Setting the DTC in order to duplicate the malfunction detected by the PCM.
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This step simulates a DTC P0131. If the PCM senses the change, the PCM and wiring are OK.
-
Program the replacement PCM and perform the crankshaft position system variation procedure. Refer to the latest Techline information for PCM programming.
Step | Action | Value(s) | Yes | No | ||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Did you perform the Powertrain On-Board Diagnostic (OBD) System Check? | -- | |||||||||||||||||||
Is the O2S voltage fixed more than the value specified? | 976 mV | |||||||||||||||||||
3 | This DTC is intermittent. Are any additional DTCs stored? | -- | Go to applicable table | Go to Diagnostic Aids | ||||||||||||||||
Is the O2S voltage within the value range specified? | 86 mV | |||||||||||||||||||
5 | The O2S is detecting a rich exhaust condition or may be contaminated. Check for one of the following conditions:
Repair any of the above or similar engine conditions as necessary. Did you find a problem? | -- | ||||||||||||||||||
6 |
Was a repair necessary? | -- | ||||||||||||||||||
7 |
Important: Before replacing a contaminated O2S determine and repair the cause of the contamination. Replace the O2S. Refer to Oxygen Sensor Replacement . Is the action complete? | -- | -- | |||||||||||||||||
|
Important:: The replacement PCM must be programmed. Refer to Powertrain Control Module Replacement/Programming . Replace the PCM. Refer to the Is the action complete? | -- | -- | ||||||||||||||||||
9 |
Does the scan tool indicate the diagnostic Passed? | -- | ||||||||||||||||||
10 | Does the scan tool display any additional undiagnosed DTCs? | -- | Go to the applicable DTC table | System OK |
